/**
  ******************************************************************************
  * File Name          : I2C.c
  * Description        : This file provides code for the configuration
  *                      of the I2C instances.
  ******************************************************************************
  *
  * COPYRIGHT(c) 2015 STMicroelectronics
  *
  * Redistribution and use in source and binary forms, with or without modification,
  * are permitted provided that the following conditions are met:
  *   1. Redistributions of source code must retain the above copyright notice,
  *      this list of conditions and the following disclaimer.
  *   2. Redistributions in binary form must reproduce the above copyright notice,
  *      this list of conditions and the following disclaimer in the documentation
  *      and/or other materials provided with the distribution.
  *   3. Neither the name of STMicroelectronics nor the names of its contributors
  *      may be used to endorse or promote products derived from this software
  *      without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  ******************************************************************************
  */

/* Includes ------------------------------------------------------------------*/
#include "i2c.h"

#include "gpio.h"

static void resetI2cBus(void);

I2C_HandleTypeDef hi2c1;

/* I2C1 init function */
void MX_I2C1_Init(void)
{

  hi2c1.Instance = I2C1;
  hi2c1.Init.Timing = 0x20303E5D;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLED;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLED;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLED;
  HAL_I2C_Init(&hi2c1);

    /**Configure Analogue filter
    */
  HAL_I2CEx_AnalogFilter_Config(&hi2c1, I2C_ANALOGFILTER_ENABLED);

}

void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  resetI2cBus();

  if(hi2c->Instance==I2C1)
  {

    /**I2C1 GPIO Configuration
    PB6     ------> I2C1_SCL
    PB7     ------> I2C1_SDA
    */
    GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF1_I2C1;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    /* Peripheral clock enable */
    __I2C1_CLK_ENABLE();
  }
}

void HAL_I2C_MspDeInit(I2C_HandleTypeDef* hi2c)
{

  if(hi2c->Instance==I2C1)
  {
    /* Peripheral clock disable */
    __I2C1_CLK_DISABLE();

    /**I2C1 GPIO Configuration
    PB6     ------> I2C1_SCL
    PB7     ------> I2C1_SDA
    */
    HAL_GPIO_DeInit(GPIOB, GPIO_PIN_6|GPIO_PIN_7);

  }
}

void resetI2cBus(void)
{
  GPIO_InitTypeDef GPIO_InitStruct;

  /**I2C1 GPIO Configuration
  PB6     ------> I2C1_SCL
  PB7     ------> I2C1_SDA
  */
  GPIO_InitStruct.Pin = GPIO_PIN_6 | GPIO_PIN_7;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_OD;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
  HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, 1);
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, 1);

  // Clock SCL until the data line is released
  while (HAL_GPIO_ReadPin(GPIOB, GPIO_PIN_7) == 0) {
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, 0);
    HAL_Delay(10);
    HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, 1);
    HAL_Delay(10);
  }

  // Generate a start and stop condition
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, 0);
  HAL_Delay(10);
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, 0);
  HAL_Delay(20);
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_6, 1);
  HAL_Delay(10);
  HAL_GPIO_WritePin(GPIOB, GPIO_PIN_7, 1);
  HAL_Delay(10);

  // Deinit the gpios and now the bus should be reset
  HAL_GPIO_DeInit(GPIOB, GPIO_PIN_6 | GPIO_PIN_7);
}
